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WHY DO WE NEED PLANTS - YEAR 8 PHOTOSYNTHESIS
- 3. Biomass • Organic material that comes from living organisms: I. Plants - wood (cooking, heat, light and fuel) II. Animals/Humans – manure/poop: converted to biogas and burned as fuel III. Garbage – convert to biogas (Electricity, production of steam, cooling, cooking)
- 4. BIOFUEL
- 6. BENEFITS OF PLANTS • Gives oxygen • Gives food • Habitat
- 7. HOW DOES PLANTS SURVIVE? • Makes their own food • Sun • Photosynthesis
- 9. Requirement for photosynthesis • Carbon Dioxide • Water • Sunlight
- 10. Photosynthesis • Takes places inside the plant cells called chloroplast (organelle). • Chloroplast contains a green pigment called chlorophyll. Carbon Dioxide + Water Glucose + Oxygen (Reactants) (products)
- 11. • Oxygen – released into the air from the leaves. • Glucose – i. cell repair ii. growth iii. converted to starch (for storage) • Cells can release energy from glucose using respiration. Glucose Carbon dioxide + water
- 13. Day VS Night
- 14. Plant Growth MINERAL ELEMENT SUPPLIED WHY NEEDED Nitrates Nitrogen, N Nitrogen is needed to make amino acids for proteins, which are needed for cell growth Phosphates Phosphorus, P Responsible for assisting with the growth of roots and flowers. Phosphorus also helps plants withstand environmental stress and harsh winters Potassium compounds Potassium, K Potassium is needed in enzymes involved in respiration and photosynthesis
- 15. Leaf Structure
- 18. Stomata • The stomata control gas exchange in the leaf. Each stoma can be open or closed, depending on how turgid its guard cells are.
- 19. The stomata can open and close to: • regulate transpiration – water loss • allow gas exchange
- 20. Root Cells • The root hair cells are where most water absorption happens. • They are long and thin so they can penetrate between soil particles, and they have a large surface area for absorption of water through osmosis. (higher conc, to lower conc.) *Notes that root cells CANNOT carry out photosynthesis.
- 21. Homework… Describe the 4 factors that affect the rate of photosynthesis
Editor's Notes
- Leaves are green because chlorophyll absorb a certain wavelength of light within the visible light spectrum but green is not absorb, but reflected by the chlorophyll which makes the leaves appear green! Most plants also have other pigments: carotenoids, which usually appear yellow to orange, and anthocyanins, which are red to purple. One pigment usually dominates. So a plant with red leaves probably has higher than usual amounts of anthocyanins, Dr. Pell said. But chlorophyll is still present and at work.
- Take note that respiration occurs all the time, be it day or night. Respiration is to fuel growth and other cellular function.
- Note that root cells do not contain chloroplasts, as they are normally in the dark and cannot carry out photosynthesis